The device was not returned for evaluation.A review of the lot history record identified no manufacturing nonconformities issued to the reported lot that would have contributed to this event.Additionally, a review of the complaint history identified no other incidents and/or complaints reported from this lot.The investigation was unable to determine a cause for the reported entrapment and tip separation resulting in unexpected medical intervention.It may be possible that the thumbslide was not retracted to the start position and the system lock was not locked prior to removing the delivery system causing the tip to catch on the stent, anatomy or introducer sheath during removal; however, this could not be confirmed.There is no indication of a product quality issue with respect to the design, manufacture, or labeling of the device.
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